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Old 07-04-2022, 06:35 PM   #1
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Wiper blade "depth"

I have pantograph wipers on a Class A rig. The wiper blades are rather deep (i.e., the distance between where it touches the windshield to the arm) and thus the blade has to flap around whenever the wiper changes direction, and it sort of dragging at an acute angle rather than wiping closer to a right angle. Just wondering if there are any brands with shallow blades?
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Old 07-04-2022, 07:54 PM   #2
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I'm having trouble visualizing the issue , any chance you could post a picture .

I converted my blades to " beam " type from Costco , lowered the arm head about 3/8" closer to the glass , took about four mins a blade .
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Old 07-04-2022, 09:56 PM   #3
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Maybe I'm not understanding what you're describing either.

From your description, it sounds to me how wipers are designed to work. If you watch how your car wiper blades function, they're doing the same thing only possibly less pronounced ...the rubber is going across the glass at an acute angle too and when changing directions, they'll flip so the angle is in the other direction. In other words, they are not going across the glass at a 90į angle either. They too are flipping direction when the arc changes.

On your car blade, you can wiggle the insert and observe it's designed to flex in both directions. The same applies to a longer blade on a pantographic arm. They should be doing the same only that flipping action is more pronounced as it's much longer and usually the insert itself is more heavy-duty.

I've driven commercial and city transit buses in the past and they mostly used a more heavy-duty blade that was in fact used thicker and wider inserts as they are meant to be used under more severe conditions and used more frequently as opposed to those used in a more light-duty circumstance.

As long as the blade is cleaning the windshield with a good swipe with no smearing or excessive streaking --and they're relatively quiet, I'd leave them be. I'd personally would not want to use a more "shallow blade" but that's only my personal choice.

I don't know, maybe I'm not understanding. Or maybe you think I'm full of it ...that could very well be as I post a lot of inaccurate information on the forum as it sometimes turns out but I'm just throwing out a personal opinion at this point.
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Old 07-05-2022, 05:04 AM   #4
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Yes, you have to shop around, some are abnormally high. I have been switching to beam type on my other vehicles. Otherwise I have good luck with Ancos. I can't remember what I bought for the rv last summer. There wasn't a big selection of bolt on types.
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Old 07-05-2022, 07:34 AM   #5
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Quote:
Originally Posted by Skip426 View Post
,,, I converted my blades to " beam " type from Costco , lowered the arm head about 3/8" closer to the glass , took about four mins a blade .
I do the same and I usually buy the biggest (usually 26" to 28"), moderately priced basic blades when I need to replace them. I get about two-three years of useful life before I replace to ensure the coach will pass the annual state safety inspection.
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Old 07-05-2022, 08:37 AM   #6
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How old are the wiper blades? They will harden with age. Because a motor home sits so much the blade will have a 'set' in the park position.


There are different saddle widths, is that correct? Are the bolts the right size?



Motor homes have huge windshields, manufacturers install blades that are much larger than needed. The drag from the windshield is hard on the linkage and will make the blades flop back and forth. Stop the wipers when they're directly in front of you. Look at what area would be cleared if the blade was 2-3" shorter on each end. Would you miss anything but sky and blacktop?
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Old 07-05-2022, 09:03 AM   #7
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There are different saddle widths, is that correct? Are the bolts the right size?
Yes ; two different widths , that I'm aware of .
In my modification , the rivet had to be removed ; as opposed to using the existing holes in the beam blade for mounting ; because the rivet head made the beam blade too wide to fit the saddle .
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Old 07-05-2022, 01:28 PM   #8
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Thanks all. Picture of blade attached. Part of the reason for this question is whether there is excessive wear and stress on the wiper mechanism with the drag.



I had an issue on the road trip where the passenger wiper arm came loose (or wouldn't return to where it should be). Thankfully I had applied Rain-X so could drive with minimal wiper use (no ladder to get up and address the issue or take off the wiper).



Anyway, got home and checked the wiper (looks like both arms are driven and not a driven arm and an idler). The tapered knurls may be a bit worn (just die-cast metal), and doesn't appear to be replaceable. I read somewhere that one is supposed to torque them down to ~37 lb-ft, leave them for an hour without using, then retorque. I did this (well, w/o a torque wrench which I don't have one of) and it seemed to work on the next mini road trip (Pacific Rim Nat'l Park Reserve FWIW) though wiper usage was minimal.



The saddle width is about 5/8" or maybe 15.8-ish mm.




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Old 07-05-2022, 07:46 PM   #9
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The only "excessive" wiper drag is introduced when installing longer than OEM blades. While I had a much larger wiper sweep area, longer blades burned up the motor and stripped the splines out of the crank arm.
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Old 07-06-2022, 11:54 AM   #10
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The only "excessive" wiper drag is introduced when installing longer than OEM blades. While I had a much larger wiper sweep area, longer blades burned up the motor and stripped the splines out of the crank arm.

Since you mentioned it, I went to measure the wiper blade length: 26".


The Trico cross reference indicates a 32" blade for the '07 and '08 year. As my coach is an early year build, I checked '06 and that indicates a 28" blade. No idea what was original as I'm the 4th or 5th owner.




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